MAX30001CTI+T: FAQ

Created over 6 years ago

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Can I miss to connect 1nF shunt-cap connected to CPLL of MAX30001 but directly connected CPLL to GND?

This is critical. Unfortunately, the user will need this 1nF cap to keep the PLL stable. It cannot be grounded. Please try to rework the board by adding 1nF bypassed to Ground.
Does ECG/EKG feature required FDA certification approval?

It is optional. It is required if the purpose of the device is for medical purposes. If the ECG feature is only used for non-medical purpose such as Bio-Identification, then FDA approval is not needed…
Does the phase offset (BIOZ_PHOFF setting in MAX30001) impact overall performance (noise, in particular) in any way?

Phase offset choice does not impact overall performance.
For MAX30001 what is the equation that relates BioZ (impedance) to the ADC output in the BioZ FIFO?

BioZ Reading (ohm) = (VREF×[20 bit ADC code]) / (BioZ Drive current × 2^19 × BioZ Gain Setting) Where VREF = 1V. BioZ Drive Current is programmable to 8uA, 16uA, 32uA, 48uA, 64uA, 80uA, or 96uA. BioZ…
How could the MAX30001 AFE also be used to measure hydration?

Question: As per MAX30001 datasheet, the AFE could also be used to measure hydration. Customers want to understand how this could be achieved using MAX30001? Do they need external analog sensor? …
How do I ensure that the ECG signals couple the same common node noise?

Since ECG electrodes would not be run in parallel over their entire path from electrode to the module, one approach to ensure both ECG inputs “see” the same noise is to add an antenna that runs in parallel…
How do I optimize Maxim ECG AFE registers?

Maxim ECG AFE (MAX30001) is a complete biopotential and bio-impedance analog front end solution for wearable consumer products. In addition to the AFE amplifier and ADC commonly found in competitive parts…
If there is a non-negligible parasitic capacitance to GND(~100pF) on dry electrodes before the EMI filters, are there any pressing concerns with this level of capacitance on the electrodes for both ECG and BIOZ?

The 100pF shunting capacitors will not cause a significant problem. They will tend to reduce the signal received back from the body a bit, but not substantially. It certainly shouldn’t be a problem for…
In the MAX30001 BIOZ channel, what is the phase relationship between the Demodulator Signal and the Drive Current signal?

The demodulator signal leads the drive current signal in phase. The phase by which the demodulator leads the drive current signal is set by the bits BIOZ_PHOFF[3:0] in CNFG_BIOZ (0x18).
Is it possible to shift electrodes to the human body backside to measure ECG signals ?

The electrodes can be placed on the back (ensuring that you are measuring the same vector). However placing the electrodes on the back will decrease the signal amplitude and may result in unwanted movement…

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MAX30001CTI+T: FAQ

Can I miss to connect 1nF shunt-cap connected to CPLL of MAX30001 but directly connected CPLL to GND?

Does ECG/EKG feature required FDA certification approval?

Does the phase offset (BIOZ_PHOFF setting in MAX30001) impact overall performance (noise, in particular) in any way?

For MAX30001 what is the equation that relates BioZ (impedance) to the ADC output in the BioZ FIFO?

How could the MAX30001 AFE also be used to measure hydration?

How do I ensure that the ECG signals couple the same common node noise?

How do I optimize Maxim ECG AFE registers?

If there is a non-negligible parasitic capacitance to GND(~100pF) on dry electrodes before the EMI filters, are there any pressing concerns with this level of capacitance on the electrodes for both ECG and BIOZ?

In the MAX30001 BIOZ channel, what is the phase relationship between the Demodulator Signal and the Drive Current signal?

Is it possible to shift electrodes to the human body backside to measure ECG signals ?

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